|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Continuous Phase Transformations
||Magnetically Driven Short-Range Order in the CrCoNi System
||Flynn Walsh, Robert O Ritchie, Mark Asta
|On-Site Speaker (Planned)
The presence, nature, and impact of chemical short-range order in CrCoNi are all topics of current interest and debate, particularly in the context of the system’s role as a model for related high-entropy alloys. First-principles calculations reveal that its origins are fundamentally magnetic, with repulsion between like-spin Co-Cr and Cr-Cr pairs that is complemented by the formation of a magnetically aligned sublattice of second-nearest neighbor Cr atoms. Serving primarily to relieve magnetic frustration, this behavior does not precede any known long-range ordered state and may in fact contribute to the metastability of the solid solution. Ordering models following these principles are used to explain anomalous experimental measurements concerning both net magnetization and atomic volumes across a range of compositions, demonstrating the effects of both short-range order and magnetic interactions.